Carbureter.



E. J. THOMPSON.

'GARBURETER. APPLICATIONTILED JUNE 24.1911.

L1 39,359, Patented Mar. 2, 1915 2 SHEETS-SHEET 1 v A1 FIG: 10 5 la a D" 2 f iii 32 1555 WiTNESSEE:

. INVENTDH 6,2 E..J-THEIMF'5UN B. J. THOMPSON.

GAREUEETER. APPLICATION FILED JUNE 24.1 911.

Patented Mar. 2, 1915.

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WiTNESSES INVENTEIH I E.J. THOMPSON.

BY AT'FY animus from: rnomsoiv, or ormwnomimocanana cansnnnm Specification of Letters rams Patented Mar. 2 1915..

Application filed nine 24, 191i. scrip! 10.1mm

I To all whom it may concern:

Be it known thatLEoMUND JOHN Tnoiun son, of 192 Slater .street, in thecity'of Ottawa, Province of Ontario, Dominion of Canada, a subject of the King of Great Britain, have invented certain new and useof which.

fullmprovenients in Carburetors, the following isa specification. I

This invention relates to improvements in carbureters and particularly to those of the type in which the valve controlling the spray nozzle is automatically controlled by the suction of the engine through the noedium of a suction valve which rises and falls with variations in the suction, said valve' also serving to control and proportion the.

air supply. I

The objects of the invention are to enable the proportion of air and combustible fluid to be always maintained constant in the varying volumes demanded by the engine and also to enable the carburetor tobesimply and eiiectively adjusted to suit the require ments of the particular engine, whereby it will operate at uniform efiiciency at all speeds. Y

Further objects are to provide a carbureter which willwork under a comparatively low vacuum, thus increasing the suction stroke pressure on the engine and assuring that a full charge is given to the cylinders at all speeds.

In carrying out these objects means are provided for adjusting the amount of opening of the valve for a given speed and also for adjusting the rate at which the air valve will open and close the oil valve to corre: spond with change in the speed of the engine. The present inventionthus provides two adjustments. one controlling the amount of opening at low speed, and the other the rate at which the opening will increase as the. engine changes to high speed.

Further subsidiary features of the invention relate to the particular construction of the suction valve and will, together with the other various novel features in the structure, be referred to and pointed out hereinafter in the accompanying specification and drawings.

In the view through the carbureter with the suction valve in the position which it would occupy at a normal intermediate suction. Fig. 2 is a perspective view of the connecting means between the suction valve and the valve. of

drawings :Figure 1 is a sectional.

the spray nozzle. Fig. 3 is a sectional view through the carbureter with the suction valve in lowermost position. whichit will occupy when the engine is not use. 4 isa side elevation. Fig. 5 is an end elevas tion. Fig. 6 is. a section on the line 2-2, Fig. 3. Fig. '1 is a sectional detailon the line 3--3, Fig. 3. Fig. 8 is a sectional detail of the contacting member and the connecting means between the float. and the valve. Fig, 9 is a section on the line 4-4, Fig. 8. Fig. 10 *is a perspective view of the threaded pin. carrying the contact roller.

In the. drawings like figures of reference indicate corresponding parts in each figure.

. Referring to the drawings A represents. the outer casing shell in suitable shape to con-- tain the working parts, the upper part of which, as usual, is provided with a tubular 4 outlet neck 10 having a flange ll to connect with the intake pipe of theengine, the passage through the neck being controlled the usual manner by a butterfly valve 12. lllounted'within the casing member and vertically reciprocable therein is the suction,

valve member B. This member is formed with a tubular portion 13 which fits the neck 10 and a lower conoidal portion 14 which regulates the air supply in the manner hereinaftcr described.

The movement of the suction valve by the suction ofthe engine is effected through the medium of a piston 15 formed on the exterior of the neck 13 and fitting closely to a cylinder 16 formed in the casing, the upper portion of which forms an air chamber which is placed in communication with the suction of the engine through the medium of a small port 17 in the neck 13.

Considerable difiiculty has been experienced in the past in properly arriving at the exact weight of the suction valve and in the present invention the suction valve is provided with a recess to receive soft readily fusible metal, such as ead, by which its weight maybe ver readily altered to suit a given standard. s illustrated an annular recess 18 is formed in the piston 15 and this recess is partly or wholly filled with fusible lead or the like.

A spray nozzle C is mounted within the float member B and is of the mushroom type radial passageways '20 which communicate with a j axial supply passageway 2l'wh1ch leads an equalizing supply chamber D. The bottom of this chamber is slightly above the discharge passageway and is supplied through an inlet passageway 21 controlled by a valve which is operated by a float 23 mounted within the chamber D. This float is designed to always maintain a constant head of combustible fuel on the spray nozzle.

To permit access to the various sections of the PHSSJQ'CWZIYS 21, which are at right angles to each other, small removable screwthreaded phigs 25 and 26 are provided opposite said passageways, adapted when the pass go way is removed, to give perfectly free access thereto. A plug vi'ded below the valve 22, by which access may be had to the same.

In order to facilitate the picking up of the combustible b the air drawn in by the suction of the engine, the top 28 of the spray nozzle made conoidal in form, tapering toward central apex, and the valve me1 n' her it, which controls the passageway, and the motive fluid, is also formed witha tapered conical top section 29 which projects above thespraynozzle. The valve member r) is also provided on its lowerside with a Lapel-oil handle 30 which controls the passage ol combustible fluid through the passageways i and 21, and it will be seen that the lilOllllh ol' combustible which can pass through the spray nozzle will depend on the oo'aition ol' the valve member and will vary m :orrespoiul with the dill'erent positions. I

The connecting means between the valve member and the suction valve are such that the rate at which the suction valve moves the valve member may be varied. 'lhese means comprise, in the main, an adjustable inclined plane F and an adjustable contact .inember (l. The plane 1* is pivotally sup ported at one side of the carluu'eter from a projection 31 on the float member and its inclination is adapted to be varied through the means o an adjusting screw 32 which .bears against a tongue 33 on the underside of the plane, the opposite side of the tongue being supported l a plunger iilwhich is normally forced upwardly by 'a compression .pringv35 located in a recess 36 in the projection.

' The Contact member ,(l includes a roller adapted to run on the inclined plane 1 said roll r being ea'rried by an axially movable pin 3%, which is screw thremlcd and is norn'ially pi mentml ll'Ulll rotation by a pin 39 extending through an axial slot 1) in the end thereof, the pin being adapted to be moved longitiulinally by means ol' a thumb nut {ll mounted thereon and which is held .l'roin longitudinal movement by lugs 42 and 43 through which the pin 38 extends, said "lugs being carried on an arm 44 of a 27 is also pro-,

bell crank lever'H, which lever has a central section 45 ournaled in a projection 46 on the lower portion of the spray nozzle and having an arm 47 loosely connected to an axially movable rod 48 which has a turned end extendin through the top of the valve member E. nthis way whenthe contact member G is swung outwardly, that is to say when it is .swung in the direction indicated by the arrow in Fig. 5, the valve member will be raised to open the spray-nozzle.

The thumb nut-41 is conveniently retained in adjusted position by means of a plunger pawl 49 located in a recess 50 and pressed against the thumb nutby a spring 51.

The valve member E isdesirably spring seated, to which end a helical spring 52 is provided carried by the spray nozzle and aving one end 53 extending across a shoulder at on the arm 48 and normally tending to move said arm downwardly and thus to seat the valve member E. v

In operation the, pistons in the engine cylinder will create a vacuum in the chamber 16 above the pistons 15, causing the air pressure to raise the suction valve B slightly. This, through the medium of the inclined plane I, in contact with the contact member G will swing the lever H, raising the rod 48 and valve member E slightly and allowing the right quantity of gasolene or other combustible fluid to pass through the spray noz- Thisgasolene is picked oil the spray nozzle by the air that rushes in to fill the vacuum in the engine cylinders. As the suction of the engine increases, the suction valve continues to rise, opening the valve still more and increasing the space between the conoidal section 14 of the suction valve and the top of the spray nozzle, thus admitting a proportionate amount of air and gasolenc.

It will be seen that as the weight of the suction valve remains constant. and as it adapts itself to the varying amount of air going to the cylinders the air velocity past the throttle will'not vary no matter what the speed of the engine may be. Consequently a practically uniform firing mixture will be automatically supplied at all speeds. When Itis desired to adjust the carburetor, the engine is throttlcd down until. the roller :37 is opposite the hinge 55 of the plane F. The thumb nut ll is then turned in or out as may be necessary until the engine gets the proper firing mixture. The throttle is then opened and the engine allowed to speed up, causing the suction valve to-carry. the plane l up under the roller 37. If the mixture is too'weah' more gasolenc may be turned on by screwing down thescrew 3'2, thereby tilting out the plane. If it is too rich, the I("l'LWIl'llly'l)(l turned in the opj'msitedirection, thereby: cutting -down the supply of ga'solene. It \villbe seen that these two adjllStHlOIllS enable the correct quantity of ga 'olene to be gaged for strong and Weak suction and the intermediate suctions will be properly taken care 0t: by the plane F.

it will be seen that the present invention enables the engine to receive its charge under the same vacuum at high speed as at low speed aside from the eli'ect of variable throttling, thereby'allowing the cylinders to get full charge at any speed they are running. lio rich or weak mixtures are likely to reach the engine, as the movable air valve member regulates the quantities of air and gasolene accurately and automatically and causes a perfect mixture to be provided at all speeds. As the air velocity remains constant, the gasolenc will always be well atomized and will be thoroughly mixed therewith owing to its manner of introduction.

its many changes could be madein the above construction and many apparently widely diii'crent embodiments of my invention within the scope of the claims, constructed, without departing from the spirit or scope thereof, it is intended that all matter contained in the accompanying specifications and drawings shall be interpreted as illustrative and not in a limiting sense What I claim as my invention is:

l. In a arbureter and in combination, a rcciprocable element actuated by the engine, a hinged inclined plane carried by said element, a tongue on said plane, an adjusting screw adapted to bear against the tongue, spring means for forcing the tongue against the adjusting screw, a spray nozzle, a valve member therefor and actuating means for the valve member includin a contact member bearing on the incline plane. v

:2. In a carbureter and in combination, a reciprocable element actuated by the engine a valve member therefor, actuating means for the valve member including a roller adapted to bear on the contact plane and be actuated thereby and adjusting means for the roller including a threaded pin carrying a roller, lugs supporting the pin, means for preventing rotation of the pin, and a nut mounted on the pin between the lugs.

3. In a carbureter and in combination, a tubular suction valve adapted to regulate the amount of air introduced, an annular piston around the same, a cylinder for the piston forming an air chamber, said sucti'on valve'havin communication with said air chamber, and a spray nozzle and valve therecarrying an inclined ane, a spray nozzle,

for operated by the suction valve.

4. A carbureter comprising a casing which forms an engine inlet member and a chamber, a compensating plunger slidably mounted with respect to said member having an enlarged portion in said chamber, said plunger forming between it and a part of the casing a restricted air passage of variable size, a fuel nozzle arranged to discharge into the restricted passage, a fuel inlet valve, and a communicating passage between said chamber and said air passage for changing the pressure in said chamber in proportion to variations in pressure in the air passage, to cause said plunger to move to thereby vary the size of said air passage, and an actuatin connection between the plunger and the valve.

In Witness whereoi: I have hereunto set my hand in the presence of two witnesses. EDMUND JOHN THOMPSON. Witnesses:

Russian B. SMART, H. Bnnron Bonner.

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